1 /* 2 * Copyright(c) 2015, 2016 Intel Corporation. 3 * 4 * This file is provided under a dual BSD/GPLv2 license. When using or 5 * redistributing this file, you may do so under either license. 6 * 7 * GPL LICENSE SUMMARY 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of version 2 of the GNU General Public License as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * BSD LICENSE 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 24 * - Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * - Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in 28 * the documentation and/or other materials provided with the 29 * distribution. 30 * - Neither the name of Intel Corporation nor the names of its 31 * contributors may be used to endorse or promote products derived 32 * from this software without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 45 * 46 */ 47 48 #include <linux/pci.h> 49 #include <linux/delay.h> 50 #include <linux/bitmap.h> 51 52 #include "hfi.h" 53 #include "common.h" 54 #include "sdma.h" 55 56 /** 57 * format_hwmsg - format a single hwerror message 58 * @msg message buffer 59 * @msgl length of message buffer 60 * @hwmsg message to add to message buffer 61 */ 62 static void format_hwmsg(char *msg, size_t msgl, const char *hwmsg) 63 { 64 strlcat(msg, "[", msgl); 65 strlcat(msg, hwmsg, msgl); 66 strlcat(msg, "]", msgl); 67 } 68 69 /** 70 * hfi1_format_hwerrors - format hardware error messages for display 71 * @hwerrs hardware errors bit vector 72 * @hwerrmsgs hardware error descriptions 73 * @nhwerrmsgs number of hwerrmsgs 74 * @msg message buffer 75 * @msgl message buffer length 76 */ 77 void hfi1_format_hwerrors(u64 hwerrs, const struct hfi1_hwerror_msgs *hwerrmsgs, 78 size_t nhwerrmsgs, char *msg, size_t msgl) 79 { 80 int i; 81 82 for (i = 0; i < nhwerrmsgs; i++) 83 if (hwerrs & hwerrmsgs[i].mask) 84 format_hwmsg(msg, msgl, hwerrmsgs[i].msg); 85 } 86 87 static void signal_ib_event(struct hfi1_pportdata *ppd, enum ib_event_type ev) 88 { 89 struct ib_event event; 90 struct hfi1_devdata *dd = ppd->dd; 91 92 /* 93 * Only call ib_dispatch_event() if the IB device has been 94 * registered. HFI1_INITED is set iff the driver has successfully 95 * registered with the IB core. 96 */ 97 if (!(dd->flags & HFI1_INITTED)) 98 return; 99 event.device = &dd->verbs_dev.rdi.ibdev; 100 event.element.port_num = ppd->port; 101 event.event = ev; 102 ib_dispatch_event(&event); 103 } 104 105 /* 106 * Handle a linkup or link down notification. 107 * This is called outside an interrupt. 108 */ 109 void handle_linkup_change(struct hfi1_devdata *dd, u32 linkup) 110 { 111 struct hfi1_pportdata *ppd = &dd->pport[0]; 112 enum ib_event_type ev; 113 114 if (!(ppd->linkup ^ !!linkup)) 115 return; /* no change, nothing to do */ 116 117 if (linkup) { 118 /* 119 * Quick linkup and all link up on the simulator does not 120 * trigger or implement: 121 * - VerifyCap interrupt 122 * - VerifyCap frames 123 * But rather moves directly to LinkUp. 124 * 125 * Do the work of the VerifyCap interrupt handler, 126 * handle_verify_cap(), but do not try moving the state to 127 * LinkUp as we are already there. 128 * 129 * NOTE: This uses this device's vAU, vCU, and vl15_init for 130 * the remote values. Both sides must be using the values. 131 */ 132 if (quick_linkup || dd->icode == ICODE_FUNCTIONAL_SIMULATOR) { 133 set_up_vl15(dd, dd->vau, dd->vl15_init); 134 assign_remote_cm_au_table(dd, dd->vcu); 135 } 136 137 ppd->neighbor_guid = 138 read_csr(dd, DC_DC8051_STS_REMOTE_GUID); 139 ppd->neighbor_type = 140 read_csr(dd, DC_DC8051_STS_REMOTE_NODE_TYPE) & 141 DC_DC8051_STS_REMOTE_NODE_TYPE_VAL_MASK; 142 ppd->neighbor_port_number = 143 read_csr(dd, DC_DC8051_STS_REMOTE_PORT_NO) & 144 DC_DC8051_STS_REMOTE_PORT_NO_VAL_SMASK; 145 ppd->neighbor_fm_security = 146 read_csr(dd, DC_DC8051_STS_REMOTE_FM_SECURITY) & 147 DC_DC8051_STS_LOCAL_FM_SECURITY_DISABLED_MASK; 148 dd_dev_info(dd, 149 "Neighbor Guid %llx, Type %d, Port Num %d\n", 150 ppd->neighbor_guid, ppd->neighbor_type, 151 ppd->neighbor_port_number); 152 153 /* physical link went up */ 154 ppd->linkup = 1; 155 ppd->offline_disabled_reason = 156 HFI1_ODR_MASK(OPA_LINKDOWN_REASON_NONE); 157 158 /* link widths are not available until the link is fully up */ 159 get_linkup_link_widths(ppd); 160 161 } else { 162 /* physical link went down */ 163 ppd->linkup = 0; 164 165 /* clear HW details of the previous connection */ 166 reset_link_credits(dd); 167 168 /* freeze after a link down to guarantee a clean egress */ 169 start_freeze_handling(ppd, FREEZE_SELF | FREEZE_LINK_DOWN); 170 171 ev = IB_EVENT_PORT_ERR; 172 173 hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LINKDOWN_BIT); 174 175 /* if we are down, the neighbor is down */ 176 ppd->neighbor_normal = 0; 177 178 /* notify IB of the link change */ 179 signal_ib_event(ppd, ev); 180 } 181 } 182 183 /* 184 * Handle receive or urgent interrupts for user contexts. This means a user 185 * process was waiting for a packet to arrive, and didn't want to poll. 186 */ 187 void handle_user_interrupt(struct hfi1_ctxtdata *rcd) 188 { 189 struct hfi1_devdata *dd = rcd->dd; 190 unsigned long flags; 191 192 spin_lock_irqsave(&dd->uctxt_lock, flags); 193 if (bitmap_empty(rcd->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) 194 goto done; 195 196 if (test_and_clear_bit(HFI1_CTXT_WAITING_RCV, &rcd->event_flags)) { 197 wake_up_interruptible(&rcd->wait); 198 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_DIS, rcd->ctxt); 199 } else if (test_and_clear_bit(HFI1_CTXT_WAITING_URG, 200 &rcd->event_flags)) { 201 rcd->urgent++; 202 wake_up_interruptible(&rcd->wait); 203 } 204 done: 205 spin_unlock_irqrestore(&dd->uctxt_lock, flags); 206 } 207